Make it easy to build progressive web apps (PWAs) that load AMP documents as their primary content source. AMP documents in this model, would be the perma links, but a ServiceWorker can intercept them and instead deliver an app shell, which then loads the AMP document inside of it. Subsequent navigations would happen inside the app shell

• Support rendering AMP documents into Shadow DOM, where each Shadow DOM instance holds a doc.
• Provide for a clear mechanism for the PWA to progressively enhance the AMP document.
• Provide a ServiceWorker library for handling document caching and app shell delivery.
• Provide a VanillaJS sample PWA.
• Provide React, Angular, Ember and potentially other sample PWAs implementing this pattern.

The initial design doc is here: https://docs.google.com/document/d/1rvcFY3Zhg6oUmRtaceEdOYuwjciVaHnYIn_tMvGbRME/edit?usp=sharing